An Asian police officer who was suspended after being falsely accused of sending racist hate mail has been told the culprit may never be caught.
Mr Virdi returned to work in 2002
Gurpal Virdi, 45, won compensation and an apology from the Metropolitan Police in 2002 after a four-year suspension.
But after an independent review of the police inquiry which found Mr Virdi guilty, the Met says it has no plans to bring any action against officers.
Mr Virdi, who returned to the force, said: "Justice has never been done".
In a statement Scotland Yard said: "The South Wales police report does not suggest any new lines of inquiry with regards to the malicious correspondence.
"As with any case, we will examine any new evidence, but we are not currently actively investigating this matter."
Mr Virdi was dismissed in March 2000 after a disciplinary panel found him guilty of sending racist mail to black and Asian officers and civilian staff at Hanwell Police Station in west London.
Disciplinary procedures criticised
But five months later an employment tribunal found there was no evidence against him.
The tribunal also found that Mr Virdi had been the victim of racial discrimination by investigating officers and he was later awarded damages of £150,000.
A Metropolitan Police Authority report on police handling of his case, which was published in January 2002, criticised the force's disciplinary procedures.
But the real culprit was never caught. Bevan Powell, of the Black Police Association, said that was not "justifiable" seven years on.
And Mr Virdi, who returned to work for the Metropolitan Police in 2002, said he will continue to fight to find out who was to blame.
He told BBC London: "Justice has never been done, the culprit has never been caught.
"Although the Met say they are a worldwide leader in detecting crime, they can't even detect something which is in-house."